My husband has a viral infection and he has severe neck pain. so why?

May be serious : Severe neck pain together with other symptoms such as malaise, fever, chills may be a sign for viral meningitis. See a doctor.

Several reasons: Muscle pain or myalgias can arise from viral infections as well as enlarged lymph nodes in the neck that may also be painful. Occasionally, there can be a viral reason for a meningitis that can present as neck pain as well.